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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688ec848f717a034704ae121bce676d9cbb6024227c87f97b85b7fac054c4c8c' 
  AND token = 'r7ivh7S4ah4Rpryw6S9mFDFpLNsTv5P8WdY+RC1A554=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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