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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b7b05c529a97494420553d2be41b536ef157ee522f5957fb235c68f044db40a' 
  AND token = 'qAEI10ITquWvf5FkE81fsK+a1T3wul9bWLVE66Nl7/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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