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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ed655bbd129018f4bdb2d615dc46c3ea241638a452188b634894a7efd6a5f7d' 
  AND token = '92D7rNMsmvLf+vfNc3KxqdsT8EtNbnyq21kgqW+Nnjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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