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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa0c8bf7521dc0ebc32b2c8792a7e20d27d771b03676b330ea97cc5b32638ff' 
  AND token = 'hP8j/5XuK4J09aIuPfiTcSpc5UsQoP7QY4LphURV0iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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