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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05c272d4e978914d1d2dd6443746f5ae9f3a00af704f1127f2fb8ae85437af11' 
  AND token = '7+RWj68gD70zn6bqW4Q+i8ox4rEWEti3D3cGPYfgfDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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