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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6fd61df44505711ad063f1f3f580955b61822f4bd5eb236e542d34fcec2581a' 
  AND token = 'CDs47CpzSSTc6CB9Unb9nGtWz7AGemEDLm9s5Glur54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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