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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c9903c33a5276c549bb43556fd927234f70c0a48c6b797de81f3df9b6f8a3f' 
  AND token = 'lrKCiskGd+Ow1+yWwyKICxXL4axEGMEAPsgh3koVLTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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