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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b3955cb960417bf1a7a181447e265ce7bc3006b4f8ca5c390a729107cc2c96' 
  AND token = 'z2JbQdNgAj5F373GGK7Ug5pqFqiAE9IkkOYX5LkxPbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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