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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f7e50852057f63d0df0a3676c7d06ed1eae650889031cace5b4ebb0f86b39c7' 
  AND token = 'rwIyEQaw/c7QIhJRi58I9cHPoQbMyZfIQSj1vDGD1gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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