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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89118e46066af028f1564019b3e0606682e53bfff114e55e25074d4778ef6c12' 
  AND token = 'n+/kw+j7lkPfw37SdqYyCVyuvU0zw55ayfrvjSrL+iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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