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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00777d566f2b4ad3d6da6766f1ea9a0354b3817584aeb3a5701d5cf842621941' 
  AND token = 'pX4piR8RBd2xVH0XLuSKaUyl8CLN/j1irOGDiPdHNpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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