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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2d1277e7463340f0ab3029bc06ac1a6416753312337c6c2bda88609bf07338' 
  AND token = 'uz+yYNIe0AppsrSBDBAwLNY3W+KEws3QBf+PlD+zqig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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