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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f03ef310e4054ddd06bac4cad17fc9bf7328bd839d4852c51517fc2082da79e' 
  AND token = '0zaaTXFhptwn6BRAom2JAVUr4z6PwAHQLiH4CP5wvzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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