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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da7bae5a87f287e6b2f914c44299a52c4448d59a8833e53cb3b74c57b6addc9' 
  AND token = 'DPEBkKGJ35eI4Tss96mDlxue7XuY0H0SG00akhz2egU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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