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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c58b51b138c6527abcc9c82fad80cdbacad3a258f78fe87261b3f4e05ee9dfe' 
  AND token = '2gfW8AaHCvQj7qfjNfBpekzmCJX08bjuHBmqoRkMgSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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