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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7796daaa85747884d5116d7766da6072e8a17a412cda942554525a21079faf71' 
  AND token = 'Ccoa9SypDmnNtUMlDl5Jf89VCr2c+vMdM2g0BRsUUqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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