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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf27a5f836a1e37b003bd42084e3c9b9854e948a516690b1e51a9d06f028ca88' 
  AND token = 'WydF4pcs3Q/S+0cgkqiBmcsDyy16uADhEaqIku9pG6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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