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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e35f77d80eaaed801dbe93eb77e62492f7b85447dd5fea9006e19cc8b7b44d' 
  AND token = 'LwmszgBsIqdECiiNEG6toL9FofqB5O+JRI51e1fwPmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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