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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59826e106b6f8a72d9003cc5d0c553a34cc59900b14fb51f7a78985b43de8cf5' 
  AND token = 'QR8Z8SrrhqRDvraXizfe09ReW5AG+RqsDpkDnV8jTpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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