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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbcdc5f71b65357c248e2b579219b0cfb6eeb56785f2f7e2dd7c84f7aba3a46f' 
  AND token = 'zzBPkAGIyg58hk7htYeB05KsbAvRUTer4cRpPyEc4EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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