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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b28640b127b1327be44819bb7ee4a571c6e34edac0eb35812f80542c4dd2e81e' 
  AND token = 'XcthoQSdqONc/55ayZ57rwDEw7MSKk957K8y/Rsl1As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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