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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d972209fa7fa7c61ecad563db7e09caa0128cdc98cdf87fd5968ffaa2b35dc5' 
  AND token = '2ksaPyVJ8iR6NwgRFy3TbzYtdTyD58REXoPJwcgtNNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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