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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba5c5d4dce5de0e373d526f463eb4f4498b6c1b29421b1d586f5234689870514' 
  AND token = '4rxi1IqtxqjJ3tCEyDF0fvhb0CbfFHMZDD/WtAZ6324=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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