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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db9e982368f25de5f527ff561be3d1a6e214ed68c67124365f890b8e523da0a9' 
  AND token = 'xpoGwNTXWLuVzreibkRTc30F0xkPkLlj9gOXIvby9sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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