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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '571e4ab99259fe9e032053b7bb8add8fa67e6caca8f6ebcb14f92e6cf3be2cb6' 
  AND token = 'l0IlI3rtfmKHcLZ30Nfj9pBY/m6hrPNqI8v5AtzEwkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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