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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bdd089843beb0eabd61c4bae6ddc80b667fd3f4721751d25d2297ec295e87ec' 
  AND token = 'mQYhiVcLruNnSiyhh/5a52XU9hZsxhJ6yKpi1lDW/5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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