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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b836c763bbef128c66224e183d175efe9c55c105046991ed69519c672c1f412' 
  AND token = '9ooLPvGEAtubx6188t0HzvYOKoU0Zn5HY3PP39eUQ9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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