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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a91a55e4f1a21148d7a4a6da57ec79ec6c0b68a91bde0dfe21c50265e1f5f8f' 
  AND token = 'IjySQ8+PaeRxJ5Z4mHDYM4ssgLvy7UBERCLimbPYzSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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