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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53708dab00aca33f9c6927ffe9d4ff4be28fbf9fc4017a86593c9a4274ae964b' 
  AND token = 'Rm5AA2NFN6JATt5dLoSUVHc/XJn/1jzlqrFFH45eXBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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