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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832962ecf60c3e5e87197145c6e5eecf8985abb243ecfaaff1097218d2ab0830' 
  AND token = 'WRcA23+dNOs/WjVNLptsF2e0U/s3yL2cS5pPBrKVpBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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