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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62f1e7f8fde1ebf9676e91dd05e6c6eef5c2b768bb17938e46e9e5018eb7411' 
  AND token = 'v3eYRrEhSk+9wi5vPWHo/j+UsSFX4KaeRnLPlbSArqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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