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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d2a0109f01f67c0d5892a85a4a225d07f5ac24a7e65d8ff7948c65e0e022ea' 
  AND token = 'xawxXVM2gy9B1xg3Wa/Ju2bFmI2loleggLxWlESbiKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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