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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a9b5c2b09205ab7f53b36b8304890889531515a627f46509cbc0a18b179253' 
  AND token = 'YeN0cB5DAcTxPzTn0tQEvqIYbydRgZB4XQOnkbwBfJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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