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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e76f4f60c24cd01e324578769f40c075f692a99108b2ef339f820d0e6c4bf2de' 
  AND token = 'p0GEmQJnkinrk9GQfaDfjDU7toyxIrcUTW9VLezKiqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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