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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5abcaf74ae6e3ab8fcd0abeab1745d6ea36b3ed1b825c6159f6246a4da46492e' 
  AND token = 'swBGSh3ecmQVgsLiZcmcinBCc33Jr3r7mavaq9T5vxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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