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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '207956df8c42e60ed9c2f95ae29e9c5aadcd14ced95f6e76f4d42a9afefb7da7' 
  AND token = 'VEYjhePiqQmP7rCyfKlu7a80lrgKDt2fj0Q4d+giUWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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