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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71268f0ad7c4bd6532e6d0d30a41a77c394e6ab081a426238a3daad7039bc4fe' 
  AND token = 'dbAH/m+7nov9xu/vCfAwGW4/JwhU4lIFE+gS3aqoc5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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