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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f61e7842043b3fe56aca632c69698b37702614e9797706c7e7b1924c8eb8bf' 
  AND token = '3AmEAJ8RZUGmyF8X3knNo9IxJUyQ4n2Ga+eHNRGxfws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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