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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '053cab766e6d34e102186e8e3f9ac671f51f06d808dc57ae66a7359efcd1c175' 
  AND token = 'B5pIDatnTVDgznB8k17H+BKAMXDUq5Sbll8LqmgP7z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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