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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56de3a12a97f586c8258112d85c241f33f1e08123fa56c0738120fd9a3c1527b' 
  AND token = 'k9KQ0YnABl+ungJNf4DF6DBVxsb9JWR3PF0XSnvoigQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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