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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29a90337eaf0a4694b9a22cc0119dbbd21f9517cf9754d08ad8b3c815499c5a8' 
  AND token = 'QllpRay+3BGVKqRHB2zIK+inAs0T2qG7kg+IMT4en7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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