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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34cdf7161367a2ffe9343aa4b6d5579e5dc96abaf2d14c2dcb327b232d816b8a' 
  AND token = 'ecUX3cOOoVmO+Lu8PuE6IE4oZ+uy+m6UlkbV3GgwRig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}