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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '009271cc2a42045f293a92cef5c0bd12e12f939d64880c619c804e52bb300303' 
  AND token = 'seeoRt+6U9K+iO1MJTqW1MiBo44cte3hQjYoenq0Rs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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