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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c35e735c7141b8893bc4b5f9bed31a84c92e7a14fe447ecf2777f3160974e2ce' 
  AND token = '9t5dhoOBjw9tQK9oLMLtpb8EHIJaGMfKrevTJQwA7Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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