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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea9e30e7aa98b20a2d8afb3da56b741bfa8696b18a5bdc675b1e4d9c889f130' 
  AND token = 'vY1YlfjBJIKgad+FKjecsSOxaOd+XA9qJBJ1J8gIz8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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