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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5698e024900abea6f2547c7058f4cf7dda3c5fb6a07e125b7ece106d4380cf57' 
  AND token = 'E+yxMDhfp1/70nmdySxEebUmPeOwcu5UKIzb2s9QlAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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