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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '099fd70c2f9547f716afcf1ee37543e20f206e6e5a5910e5442fff63c3a7c6c4' 
  AND token = '1yV/cujDk4lu0WeQFdjXsPX1BxaM3ZZY/g8xSisxFmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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