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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad8db304c1189c47aca42951479b3b4a0af62287017fa8abb6ece6b2a83eafaf' 
  AND token = 'NPrvRJtSc1JpdjcVTF0fycesMfM304VbeBWw0uofdEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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