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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6ad40990984e4f130b017d359828bea7b5249fac344ea18ad99405d78c6f8d' 
  AND token = 'wwyDKWrJ7PKHaLrsEwtug5iRLeVQR5XQl76ogeLLwGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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