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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc3849e171d6359893da366f969252680f32c9e72dee0027704ea602de43e012' 
  AND token = '7kGWPDo1dDNU4AeTbyJlDHHjoekLYBz6rHn5tG/dPQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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