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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f441ea8d5ac8fc5aa42fc6b7da1929d92d81417ce58fc3252a05e382ea043317' 
  AND token = 'VthHNRE5jPQomrvfL39DJqcCvZIK5z65QN9Dq9yyNro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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