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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b1cba5ca1e96bcbe466166ea209ea263150b5c80fff3d569564989c2c67cfb' 
  AND token = 'fpLv3LxoySMeU2yJzZwHCIi/tLkvrldTE/dt9rHUDrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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