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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d742ecc232c460d3edd784ae177958a40db1c484efd380df90d6bf0a63284b7' 
  AND token = '/eTpz49LzrPMUmllcUbO1i6uyqDojdB0JKto/HWWucU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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