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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88b028e84af53045711897cbbbedd0537214798fd0b8115d225c9779ad6503b8' 
  AND token = 'bKFu6av/g/eaol2lMWVOhgoz+AxhxcAEjkCnktAcp9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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