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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd371ec35359c20b84218c0e96bec77ab9b5d78e139cd63c3c119d214e0fd3d' 
  AND token = 'B58DhEHbgbBEdUdF8wDRigvGRfO7/pUL01ppjoT0RdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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