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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c35d77f3fa014cc7e28b6a5e6d33e26a02ea12bbe8ccd6e7e8eaf208766e407' 
  AND token = 'EasYCwQkxe09FjcvdfRthYa15F7pAQdc1OagNWb5VPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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