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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51b1943701a90bd6b0aa3b3c49b9a223764ea5f138fae105c0f86fb7e26abdfc' 
  AND token = 'vKkFobcAtlahVAj052QHwM3WkL85O2W27Db53Mmc1eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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