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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f373d460b529f2bc0c086b0b2e8e75c91d3e9b509eb2330f524a9d78c212e59e' 
  AND token = 'aZIpfl7QECgkFfjSqulpe3/U1e+vSUxAroc6vBYp3gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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