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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90aa0362970540758ef02c04649a5e1dc8c93f9cafaeff04613d185a35f75591' 
  AND token = 'GTvY5qjXEGczUcRWOStu9/RJT9DIc2PoynswOf+dnCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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