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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1baf0917cb8f17a1f132219205308068378b30a63bb39de90962c83c84aa6ae3' 
  AND token = 'vOw+LB2liRCTIZ/8bv/r5Z7Lvmbz7EX4WWcMixWIkok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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